I do understand how buggys drive and jump, trust me
and have built many jumps and features over the years both from wood etc and soil/astro.
If you expecting people to double/single, single/double or triple the sequence then a longer downslope would be better. Especially if they are moveable so you can turn them around if you want to run the track in the other direction. Just look at motox etc.
How high are they? How long/steep are the up/down slopes? How high are you expecting the cars to jump?
Just MHO
G